After eight-year study on effects of soil and water conservation measurements which were alley cropping,cross channel and cross planting on sloping land in Guizhou,the results showed soil erosion on the bared sloping farmland was very serious.The runoff reached 4044.4 m³/ha·a and the soil loss reached 172.4t/ha·a on it.The topsoil (15cm) will be eroded and the productivity of soil will be lost after 12 years in case of such erosion.Cross channel measurement on sloping land could reduce runoff by 702.6m³/ha·a and soil loss by 19.2t/ha·a compared with cross planting measurement,but the crop yield and income were low since the cross channel occupied much more area of land.Alley cropping measurement could reduce runoff by 345.3 m³/ha·a and soil loss by 21.0t/ha·a in comparison with cross planting measurement.Although parts of land were occupied by alley crops,the crop yield did not reduce.Soil pH,soil texture and nutrition contained in top soil were enhanced and the soil erosion rate was further lower than soil weathering rate under alley cropping measurement.Combined with land cultivation, the sloping land could be terraced at a speed of 17.5cm per year and slow down the sloping at a speed of 1.1°.The sloping land to be terraced and to be cultivated sustainably can be achieved under the alley cropping measurement finally.